Safety hook for hoisting machines



Dec. 15, 1931. BRUEL 1,836,107

SAFETY HOOK FOR HOISTING MACHINES Filed Jan. 5, 1931 Patented Dec. 15, 1931 UNITED STATES PATENT OFFICE.

JEAN BRUEL, or GLICI-IY, FRANCE SAFETY HOOK FOR HOISTING MACHINES Application filed January 5, 1931, Serial No. 506,820, and in France January 11, i930.

embodiments of the subject-matter of the in.

vention.

Fig. 1 represents, as the first embodiment, a hook in its closed position, in elevation;

Fig. 2 shows the same, partly in section, in its open position, the front pawl being consequently removed;

Fig. 3 represents the second embodiment in a view similar to Fig. 1; and

Fig. 4 shows the same hook, closed, in perspective.

The flat hook at is provided at its upper end with a head a which has a nose a The nose a of the hook is at its lower end. At both sides of the hook are flat locking fingers b pivotally connected near their upper extremities to a rear point a of the head a and also provided at their upper ends with extensions or arms (Z connected to each other by a sleeve 6.

The rope or chain of the hoisting machine attaches itself by a stirrup, link or otherwise to the arms (Z of the fingers b, for example to the cross-piece or sleeve 0. (Figs. 1, 2.)

On tensioning the rope or chain, the sleeve 6 abuts against the lower part of the nose so that the load is transmitted through the medium of this sleeve from the nose di to therope or chain of the hoisting machine. The supporting surface between the sleeve 6 and the nose (1 can be fiat or arched.

The hook is so shaped that when unloaded (Fig. 2) the bottom f of the hook is substantially in the same vertical line as the axis of the sleeve 6.

Fig. 1 shows that when the rope or chain is detachment of the. lifting member 7" from the hook is dispensed with.

lVhen the hook passes over a pulley the contact cannot occasion an opening of the hook because the nose a prevents all pressure upon the locking fingers.

Finally, when the load, on descending, touches the soil, owing to the weight proper of the hook, the fingers remain in their raised positions, the sleeve 6 abuts below the nose a and the fingers cannot get higher than shown and the ring or lifting member f of the load forces itself between theparts b and a and prevents all possibility of opening of the hook. I

The fingers can be connected to each other also near their lower extremities by means of a bridge 6 limiting the extent of oscillating movement of the fingers b at the opening of the hook and facilitating the opening.

According to the embodiment shown in Figs. 3 and 4 the rope or chain of the hoisting machine is attached to a point different from the sleeve 0, for example to a point 9 situated higher than the nose a and outside of the hook, this point 9 being normally situated; (Fig. l) vertically above 7.

For thispurpose the lugs cZ continue into extensions h projecting upwardly and con-J nected to each other above the head a by a piece The rope or chain of the hoisting machine is attached to these extensions, at g.

The extent of oscillations of the pawls at opening thehook can be limited by means of suitably provided abutments one of them being provided on the head a of the hook and the other on the cross-piece 7'. It is also possi- 1 ble and more simple, to use the border of the head a eccentric with regard to the axis 0, n

so as to obtain an abutment, as indicated in F ig. 3. r

The invention is of course not limited to the two embodiments described and shown, and permits numerous modifications both with regard to the general arrangement and to the details, without departing from its scope.

hat I claim, is: Y

1. A safety hook for hoisting devices, having a bill at the lower end and a nose at the upper end extending from the same side of the hook as the bill and a locking finger pivotally connected to the upper portion of the hook and adapted to close against the bill, said finger having a laterally extending portion at its upper end arranged for the attachment of a hoisting cord thereto and having nieansto close against the under side ofthe nose.

2. A hook of the class described, having a bill at its lower end and a nose at its upper end extending from the same side of the hook as the bill, a pair of locking fingers arranged one on each side of the hook and pivotally connected at their upper ends to the upper portion ofthe hook, the said fingers having later ally extending portions at their upper ends arranged for the attachment of a hoisting cord thereto and being provided With c0nneoting means between said extensions to bear against the under side of the nose when the fingers are in position to close against the bill. 7

In witness whereof I affix my signature.

J EAN BRUEL. 

